Originally posted by jatrax Ah, I read that post as "lens" singular and thought the poster was talking about something new or maybe the 18-80ish f/2.8 or something. Did not think of the "HD limiteds". I fear using HD on these was a mistake as too many will assume the HD is related to video rather than the coating. I'm surprised they used it actually as I thought 'HD' was trademarked for a video format.
No, it's not assuming... is anti-Pentax propaganda; don't listen to that.
A more natural connection would be with the HD/non-HD TVs, and that's all about resolution. I think you're thinking too technical, going straight to the 1080p video format; but would the average consumer do the same?
Originally posted by Mistral75 HD was a trademark for Hoya filters (still is) well before it was used by Pentax.
I doubt there's any connection between the technologies, though it might be possible Hoya wanted to "uniformize" things and profit from Pentax' coating experience/research.
After all, Pentax never stopped developing new coatings, and have a very good reputation in this field. Hoya... just do a comparative patent search